Table 4. List of PDB three-letter identifiers (PDB codes) for PEG and PEG MME fragments with n ≤ 14.

Many additional and inconsistently named fragments of presumably the same chemical entities exist, terminating with two C atoms (examples are 16P, 7PE, AE4, AE3, P3G, PE4, PE5 and others).

No. of PEG units (n)	PEG PDB ID C2nOn+1H4n+2 HO(CH2-CH2-O)nH	PEG MME PDB ID C2n+1On+1H4n+4 HO(CH2-CH2-O)nCH3
1	EDO	MXE
2	PEG	PG0
3	PGE	TOE
4	PG4	ETE
5	1PE	1PG
6	P6G	P15
7	P33	—
8	PE8	7PG
9	2PE	—
10	XPE	—
11	—	—
12	12P	—
13	33O	—
14	PE3	—